Number 83 (Story #2), June 8, 1992 by Phillip F. Schewe and Ben Stein THE MT. PINATUBO ERUPTION in the Philippines in 1991 "produced the largest climate-modifying cloud since Krakatau erupted in Indonesia in 1883, "says a new report by the American Geophysical Union (AGU). The report, "Volcanism and Climate Change, "asserts that volcanic sulphur aerosols cause significant depletion of the ozone layer. The report also concludes that "the sulphur content of an eruptive cloud, and not dust or ash, is the essential variable responsible for altering climate, at lease in explosive eruptions."